| Project/Area Number |
08650566
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | Kochi National College of Technology |
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Principal Investigator |
YOSHIKAWA Masaaki Kochi National College of Technology Department of Civil Engineering Professor, 建設システム工学科, 教授 (20280480)
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| Co-Investigator(Kenkyū-buntansha) |
竹内 光生 高知工業高等専門学校, 建設システム工学科, 助教授 (50124128)
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| Project Period (FY) |
1996 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1997: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | AC servomotor / active mass driver / closed-open-loop optimal control algorithm / model shaking table test / Seismic response control / 開閉ループ制御則 / フィードバック・フィードフォワードループ制御 / 付加質量型制振装置 / 大型塔状構造物又は高層建物 / マトラブのSimulink / H_∞ / ロバスト制御 / フィードバック・フィードフォワードループ制御則 / 付加質量型制御装置 / 一次遅れ要素 / マトラブ |
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| Research Abstract |
The new control algorithm has been introduced to a model eight-story building to demonstrate reduction of vibrations caused by medium earthquakes. As forced vibration tests, sinusoidal excitation to identify the dynamic characteristics of the model structure, non-stationary random wave excitation tests using filtered white noise wave as well as EL Centro NS seismic wave were carried out on a 4m by 4m shaking table. An active dynamic mass damping system installed at the top floor of model structure driven by an AC servomotor through a ball screw was developed. The optimization of the controller is performed taking into account the dynamic characteristics of AMD with the driving mass of 1. kgf. By carrying out digital computer-controlled tests and numerical calculations using the model frame structure, we have obtained that the proposed open-closed control algorithms could perform good control efficiencies and there is an ample possibility for them to be used for seismic response control of actual structures.
The principle results of digital computer-controlled tests and numerical calculations using the model frame structure are summarized as follows :
(1) Effects of the control parameters on the system's response are expressed by two independent variables. One controls the level of feedback, the other reflects the level of input excitation. For a given structural system we found that there are appropriate control parameters to maximize the control efficiencies. From the modal control algorithm, we derived the optimal feedforward gain to offset the excitation term.
(2) Results of the experimental studies done to examine the applicability of the developed optimal control algorithm to an active mass driver system driven by an AC servomotor showed that the proposed closed-open-loop control algorithm gave better control efficiencies than the closed-loop control algorithm and that the seismic response control of actual structures is possible by using them.
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